While you're on the hunt for vacuum leaks, make sure there isn't fuel in the vacuum hose going between the intake manifold and the fuel pressure regulator (FPR). The FPR has a diaphragm in it, which when leaking will lead to fuel entering the intake manifold. This can cause a high idle, increased fuel consumption and driveability issues related to having a rich mixture. The FPR is very easily replaced, and I believe costs less than 100 Euros.
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 Present: 1990 240GL saloon, 1992 240 estate
Past: 1988 240GL; 1971 144DL; 1972 145DL
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